Maritime Terminology

Not Under Command (NUC)

Not Under Command (NUC)

Definition

A vessel unable to maneuver as required due to exceptional circumstances — must display two black balls by day and two red lights vertically by night under COLREGS

Exam Relevance

This term is tested in DG Shipping MEO Class 4 orals, 2nd Mate FG assessments, and STCW competency evaluations. Ensure you can define, apply, and give an operational example.

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